// Request an access token for the application

    $url = 'http://oa.dnc.global/token';

    $datas =  array( 
        'grant_type' => 'authorization_code',
        'code' => $authcode,
        'redirect_uri' => 'http://chemindeleau.com/callback_openid.php',
        'client_id' => 'chemin_openid', 
        'client_secret' => '01fc458',    
    );        

    $ch = curl_init();

    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/x-www-form-urlencoded'));
    curl_setopt($ch, CURLOPT_POSTFIELDS,  http_build_query($datas));
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HEADER, false);
    curl_setopt($ch, CURLOPT_TIMEOUT, 30);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);

    $result_json = curl_exec($ch);
    curl_close($ch);

    $result = json_decode($result_json, true);
    $access_token = $result['access_token'];  // Access Token
    $id_token = $result['id_token'];                    // ID Token (JWT)